Turret punch



Dec. 26, 1933. J ROLLINGS 1,940,883

TURRET PUNCH Filed Feb 11, 1932 ZSheets-Sheet l 1N VEN TOR.

A TTORNEYv Dec. 26, 1933.

E. J. ROLLINGS TURRET PUNCH INVENTQI'Q.

2 Sheets-Sheet 2 ATTORNEY.

Patented Dec. 26, 1933 UNITED "STATES. PATENTOFFlCE-i 7 murmur PUNCH 4Ernest John.Rollings, Philadelphia, Pa. Application February 11, 1932.Serial No.59a254 3 Claims. (Cl. V 16491) The object of this invention'isto devise a novel construction and arrangement of a turret punch whichis readily portable and which can be manually operated. V I v A furtherobject of this invention is to devisea novel turret punch whereina deepthroat is provided, said throat not being limited by either the radiusor diameter of turret but can be made as large as required for the samediameter of turret so that large sheets can be punched a distance fromthe marginal edge ofthe sheet and wherein novel means are employed formultiplyingthe pressure applied to the punch so that in case of thicksheets the additional pres ure desired will be imparted at the beginningor the operative stroke of a punch. a

A further object of the invention. is to devise a novel turret punch,wherein the punch' head and the die head are revolubly mounted in anovel manner and wherein novel means are provided ,for locking the headsin the position. to which they have been adjusted. i 1

Novel means are also provided for securing the punch holders in positionwith automatic means for taking up wear or back lash inpunch holders.

' With the above and otherobjects in View, as will hereinaftermoreclearly appear, my invention comprehends a novel construction and.arrangement of a turretpunch. 7

It further comprehends a novel turret punch having a. novel constructionand arrangement of a frame providing a deep throat, a novel constructionand arrangement of rotatable punch and die heads, novel means forlocking said heads in alignedposition and for. centering the heads ifthey are not exactly aligned with thelocking mechanism. v. H I 'f Itfurther. comprehends novel mechanism controlled by the operator forapplying pressure to the punch-sothat an improved mechanical .ad-

vantage will be obtained when punching. thick material as compared withother methods of obtaining pressurewhich are not eflicient on thickmaterial. This mechanical advantage is practically equal whenpunchingany thicknessof material.,

It further comprehends novel "means for locking a punch carrier in.position in thehead with automatic, wear adjustment. w Othernovelfeatures of cOnstructionandadvantage will hereinafter more clearlyappear in the detailed description and the appendedclaims.

. ,For the purpose of illustrating the invention I haveshown in' theaccompanying drawings a typical embodiment'ofit, which, in practice,will bodying my invention. The frame is in the form sprocket wheel 16give satisfactory and reliable results. It is,.however, to-be understoodthat the various instrumentalities of which my invention consists can bevariously arranged and organized, and my invention isnot limited to theexact arrangement and organization of these instrumentalitie's as hereinset forth. V

Figure 1 is a side elevation of a turret punch embodying my invention.

Figure 2 is a front elevation thereof, partly broken away. o

- Figure 3 is a sectional elevationtaken' through the center of thepunch.

Figure 4 is a detailed viewof the control for the locking plungers whichlook thepunch holders (0 and die bolster in adjusted position.

Figure 5 is a top plan view of alo'cking plunger. I r v Figure 6 is adetailed view of a punch carrier and its locking plunge'n' Similarnumerals of reference indicate corresponding parts. Y 1

Referringto the drawings:i- V 1 designates the frame of .a turret. punchemof a yoke having a deep throat 2 in order to enable itto-receive'sheets which can be punched a considerable distance from theedges of thesheetsr 3 designates the die bolster". which is, rotatablymounted. on a stud 4 secured .to the frame. The die bolster has securedto it in any desiredmanner, the dies 5. 6 designates the punchholderwhich is rotatable on a stud 7- secured to the frame 1. The die bolster3 is provided'with the circumferentially spaced recesses S-openingthrough its periphery, opposite walls of such recessesconvergingout'wardly. In

a similar manner the punch holder 6 is provided with thecircumierentially spaced recesses 9 whichopen through its; periphery andopposite walls of such recesses divergeoutwardly.

The punch holder and the die bolster are operatively connected sothat-they can besimultaneously adjusted by a partial rotation and forthis purpose the die bolster is provided with a sprocket wheellO aroundwhich passes a chain II, which also passes around an sprocket wheel 12fixed to a shaft 13 suitably journalle'd in the frame of the machine.

The punch holder, 1n a similar manner, has fixed to it a sprocketwheel-l4 around which passes a chain 15 which also passes around a fixedto the'shaft 13. It will thus be seen that when a partial rotation isimparted to the punch holder the die bolster will be moved in unisontherewith.

17 designates a locking plunger for the die bolster, slidably mounted inthe frame 1 and at its forward end it has opposite sides convergingforwardly so that it willaccurately align the die bolster when it ismoved forwardly into a recess 8 of such die bolster. p

A spring 18 is inserted between the rear end of the locking plunger andthe frame thus tending to move the plunger forwardly. This spring is ofsuch length that it limits the rearward move ment of the lockingplunger.

In a similar manner a locking plunger 19 of the same construction asthat of the locking plunger 17 is movably mounted'in the frame andadapted to enter a lockingrecess 9 of the punch holder in registrytherewith, and aspring 20 is provided to effect the forwardlocking-move+.

ment of the plunger. The rear ends of the plungers 17 and 19 areconnected by a cross bar 21, 'the'plungers being slotted to receive thebar, and the bar being secured in position by means of the pins 22. Thebar is provided'with a slot v23 into which extends a stud 24eccentrically carried by a shaft 26, journalled in'the machine frameandprovided with an actuating handle 27. This handle 27 is arranged tolock the plungers either into registry with the turret or 'to lock theplungers out of the turret.

. In orderto compensate for wear I provide a take-up mechanism for thechains 11 and 15 it being seen that their' journal boxes 28 are mountedbetween the opposed adjusting screws 29 in threaded engagement with thejournal .brackets 30. 1

The upper part of the yoke of the frame near the open end of the throatis provided with a reciprocable' ram 31 which is-pivotallyconnected witha toggle arm 32 by means of a rod 33. The upper arm of the yoke of theframe has fulcrumed on it at 34, a segment lever 35 which is in meshwitha gear 36 fixed to a shaft 3'7 which latter is provided with anactuatingarm 38, ar-

ranged to make approximately one-half oi a revolution. The toggle arm.32 is pivotally connected at 39 to the arm 35 intermediate its fulcrumpoint and'the gear 36 so that it has normally an inclined position. Itis to be noted that the fulcrum point of thelever 35 is in a differentvertical plane from that'of the median line of the ram 31. I The ram atits forward end is slotted as at 40 to receive the upper ends of groovesor slots 43 into which extendthe plungers the punch carriers 41. Thesepunch carriers 41 at their forward end are adapted to receive thepunches42 connected therewith in any desired or conventional manner; Asillustrated the punch carriers are recessed to' receive the punches. v V

The punch carriers l-l are provided with the 4e slidably mounted in thepunch holder 6 and springs 45 are provided which tend to move theplungers 44 forwardly into fractional engagement with the punch carriers41 so that the latter are retained inassembled position with respect tothe punch holder 6. The springs 18 punch holder or head 6 and the dies 5are assembled in the die bolster. The handle 2'7 is actuated to causethe disengagement of the locklocked to allow the locking plungers toride on the periphery of the turrets.

A further alignment of the turrets allows the plungers to snap into thelocking recess of the punch holder and die bolster to accurately alignthem in position,

the handle 27 being then used to lock them. The 'sheetor other member tobe punched is inserted intothe throat 2 and the handle 33 is movedforwardly thereby causing the downward-or operative stroke of the ram31. e

' The cross bar 21 which connects the locking plungers 17 and 19 isfloating so that it is necessary to actuate only a single handle 27 tooperate and lock both plungers. When such handle 27 is partially turned,the locking plungers will be moved into unlocked position. If at suchtime only one plunger was in unlocked position, the other plunger willbe positively move into its unlocked position. e For purpose ofillustration I have shown chains employed for interconnecting the punchholder and die bolster but it'will be apparent that other equivalentmechanical means, such as, for example, gears, can be employed toaccomplish the same result.

The controlling mechanism for the ram is such that a toggle arrangementis provided which will impart a powerful thrust to the ram so that theturret punch can be employed for punching com-' paratively thick sheets.

In Figure 6 I have shown more in detail the manner in which: a lockingplunger cooperates with a punch carrier to retain it in'position, itbeing seen that the punch carrier is provided with a groove or slot,opposite walls of which diverge outwardly, and the cooperating end ofthe locking plunger is correspondingly shaped to engage the walls of therecess and overhang the periphery of the punch carrier, thus providingautomatic and accurate take up for wear.

While I have illustrated my present invention as designed to be manuallyoperated it will be apparent that it may be power driven if desired, itbeing simply necessary to interconnect the shaft of the driving motorwith the gear 36.

It will now be apparent that I have devised a new and useful turretpunch which embodies the features of advantage enumerated as desirablein'the statement of the invention and the above description, and while Ihave, in the present in stance, shown and described a preferredembodiment thereof which will give in practice satisfactory and reliableresults, it is to be understood that this embodiment is susceptible ofmodification; in various particulars without departing from the spiritor scope of the invention or sacrificing any of its advantages.

Having thus describedfmy invention what I claim as new and desire. tosecure by Letters Patent, is: i

1. In a turrent punch, a frame having a deep throat, a diebolsterrotatably mounted in said frame, a punch holder rotatably mounted insaid frame, the depth of said deep throat being indeiio able connectionsto both said punch holder and said die bolster whereby they can besimultaneously rotatably adjusted by rotating said shaft,

means to align and lock said punch holder-and die bolster, a ramreciprocable in said frame, a toggle arm connected with said ram toactuate it, and manually actuated means to actuate said toggle arm.

2. In a turret punch, a frame having a deep throat, a die bolsterrotatably mounted in said frame, a punch holder rotatably mounted insaid frame, a shaft mounted in said frame, a chain connecting said punchholder with said shaft, a chain connecting said die bolster with saidshaft, manually actuated means to simultaneously lock said punch holderand die bolster in aligned position, a reciprocable ram, and means toactuate said ram.

radiusof said die bolster and 3[ In a'turret punch, a frame having adeep throat, a die bolster rotatably mounted in said frame, a punchholder rotatably mounted in said v frame, a shaft, sprocket wheelsthereon, chains engaging said-sprocket wheels and said punch holder and.die bolster to simultaneously adjust them, said punch holder and diebolster having recesses with opposed inclined walls opening throughtheir peripheries and circumferentially spaced, locking plungers havingopposite sides inclined, and movably mounted in said frame to enter saidrecesses, resilient means to effect the forward movement of saidplungers, manually actuated means to effect the rearward movement ofsaid plungers and to lock them in both their forward and rearwardpositions, a reciprocaole ram, and means to actuate said ram.

ERNEST JOHN RoLLINGs.

